Reaction #725875

Reaction equation

diethylamine

thionyl chloride

benzoic acid

benzoic acid

→

N,N-diethyl benzamide

Solvents

H2O

Conditions

Workup

1. 1
   workup.DISSOLUTIONdissolved
2. 2
   OtherExcess thionyl chloride was removed under reduced pressure
3. 3
   Otherleaving the crude acid chloride as a low melting solid which
4. 4
   Otherwas used without further purification
5. 5
   workup.DISSOLUTIONThe crude acid chloride was dissolved in CH2Cl2(20 mL)
6. 6
   workup.ADDITIONTo this stirred solution was added triethylamine (4 mL)
7. 7
   Temperatureto warm to room temperature
8. 8
   OtherThe reaction mixture was transferred to a separatory funnel
9. 9
   OtherThe organic layer was separated
10. 10
    Washwashed with 5% HCl (2×25 mL), H2O (25 ml)
11. 11
    Dryingdried over Na2SO4
12. 12
    OtherThe solvent was removed under reduced pressure

Procedure

A mixture of thionyl chloride (6 mL) and the benzoic acid was heated at reflux until the starting benzoic acid dissolved. Excess thionyl chloride was removed under reduced pressure leaving the crude acid chloride as a low melting solid which was used without further purification. The crude acid chloride was dissolved in CH2Cl2(20 mL) and cooled to −10° C. To this stirred solution was added triethylamine (4 mL), followed by the dropwise addition of diethylamine (1.4 equivalents). The heterogeneous reaction mixture was allowed to warm to room temperature and was stirred for 30 minutes. The reaction mixture was transferred to a separatory funnel containing H2O (20 mL). The organic layer was separated and washed with 5% HCl (2×25 mL), H2O (25 ml), and dried over Na2SO4. The solvent was removed under reduced pressure to afford the product N,N-diethyl benzamide.

Source